[Samba] ;; connection timed out; no servers could be reached.

[Jason Long]

Hello,
My Samba service is running and the contents of my "/etc/resolv.conf" file is:

search mydomain.z
nameserver 192.168.56.7

When I run below commands, then I got ";; connection timed out; no servers could be reached" error:

# host -t SRV _ldap._tcp.mydomain.z.
;; connection timed out; no servers could be reached

# host -t SRV _kerberos._udp.mydomain.z.
;; connection timed out; no servers could be reached


Why?

Thank you.